Outbound mail bouces with 554 Security violation

Discussion in 'Technical' started by dipeshmehta, May 3, 2016.

  1. dipeshmehta

    dipeshmehta Member

    I have been using onsite deployed Zimbra server. Since last few days, outbound mails to one particular domain is getting bounced with '554 Security violation'
    <[email protected]>: host remotehost[xxx.xxx.xxx.xxx] said:
        554 Security violation. Email Session ID: {571F3BE7-10034-D18A8C0-C00XYZ01}
        (in reply to MAIL FROM command)
    I have hardware firewall (Watchguard) installed on gateway and it scans all SMTP traffic incoming on port 25. If I disable firewall, the message goes to remote domain without any problem, but I can not keep it disabled all the time, obviously. This has been started just few days back, earlier all mails to that domain was flowing ok.

    I understand, this issue might not be related to zimbra in any way, but I need guidance about what to check in my firewall setting to get the rid of the said issue.

    Thanks in advance.


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